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FC Fabric Extension Issues

FC Fabric Extension Issues. Charles Monia Nishan Systems Corporation August 13, 2003 T11/03-499v1. Problem. Which development direction for extended fabrics? Common fabric architecture or vSANs orthogonal to other partitioned fabric Architectures. Proposed Architectures.

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FC Fabric Extension Issues

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  1. FC Fabric Extension Issues Charles Monia Nishan Systems Corporation August 13, 2003 T11/03-499v1

  2. Problem • Which development direction for extended fabrics? • Common fabric architecture or • vSANs orthogonal to other partitioned fabric Architectures Page 2

  3. Proposed Architectures • Address the following issues: • Increased connectivity, scalability, physical resource sharing and fault isolation. • Continued support for legacy devices • vSANs (03-220v0, 03-352v0, 03-354v0) • Partitions physical fabric into isolated virtual fabrics • Inter-Fabric FC Architecture (03-219v1) • Defines multi-fabric SAN with inter-fabric connectivity • “Fabric Expansion Requirements” (03-332v0) • fabric partitioned into “sub fabrics” similar to inter-fabric FC architecture. Page 3

  4. Goals of a common architecture • Reduce complexity • One Extended Frame Format • Common architectural elements, such as: • Switching function • Gateway function • Make vSANs more extensible • Incorporate vSAN-style resource partitioning within a single physical box (as suggested by 03-219v1). • Per T11/03-332 Requirements • Preserve inter-fabric and vSAN fault isolation • Support legacy devices Page 4

  5. Basis for common architecture • All extensions define a two-level hierarchical address space. • vSAN I/D + 24-bit FC address • Fabric I/D + 24-bit FC address • Suggests that it may be possible to define a common extended frame format and architecture • vSAN becomes a special case Page 5

  6. Extended SAN SAN Inter Fabric Addressing Inter Fabric Services Inter Fabric Network Fabric/vSAN C Fabric/vSAN A Fabric/vSAN B Gateway Function Fabrics/vSANs Switch Function End-Device Page 6

  7. Ingredients • Common elements • Hierarchical address format • Tagged frame format • Added components (from 03-219v1, 03-332v0) • Gateway • Extended routing architecture Page 7

  8. FC Extended Address • Hierarchical address space: • Fabric/vSAN Identifier • Standard, 24-bit N_Port I/D Page 8

  9. Tagged Frame Format Contains source vSAN/FabricI/D and destination vSAN/FabricI/D Tagging Header Contains 24-bit D_ID andS_ID FC Frame Body Page 9

  10. Functional Components • Switch Function • Provides fabric attachment for a collection of E_Ports or F_Ports belonging to the same vSAN or fabric. • Per 03-219v1, 03-354v0, physical switch may house several switch functions. Page 10

  11. Functional Components (con’t) • Gateway Function (from 03-219v1) • Provides inter-fabric access for the N_Ports within a fabric. • Several gateway functions may be housed within a physical switch or gateway Page 11

  12. Routing Extensions • FC-SW Extensions • Define routing plane for inter-fabric traffic • Routes tagged frames to the appropriate gateway for forwarding • Routing policy applies to tagged frames within a fabric or the inter-fabric network. Page 12

  13. Gateway Function • Handles all Inter-fabric Frame Traffic • Supports inter-fabric access by non-extended N_Ports • Maps extended N_Port addresses on remote fabrics to 24-bit addresses on local fabric. Page 13

  14. Gateway Function Local Fabric Traffic Inter-fabric Traffic Untagged Frames Frame Mapping function Intra-fabric Tagged Frames Inter-fabric Tagged Frames Inter-fabric Tagged Frames Page 14

  15. Charter for WG consideration: • vSANs and other extended fabric implementations should be derivable from a single architecture incorporating: • Common addressing and frame format • Common routing protocol Page 15

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